Sonic 2 Secret Rings Edition is a hack of Sonic 2 by MainMemory. It features no new art or level layouts, and few new features, instead adding replayability to the original game by adding various missions that you can attempt to complete, although there are several levels where completing certain missions is impossible, and some levels where it is impossible to lose.

This is a hack based if the original Sonic 2, that has been in the works for quite some time. It includes 4 characters to choose from all with different moves that fit them. Every level in this demo has had a background change, along with new music in each act. Layout changes (Knuckles has some of his own) and much more...Story: Shadow is back and teams up with Robotnik...Credits:Project Leader: JoenickROSLayout: NeofusionBox, JoenickROS, Markeyjester, Electroball, Shockwave, BakayoteMusic and Sound: JoenickROS, Bakayote, KCEXESounddriver: Flamewings S3K driverArt: Blazer, Bakayote, KCEXE, AsuharamoonMinor Coding: JoenickROSMajor Coding: Shockwave, Varion Icaria, RalakimusBeta Testers: Mike B Berry, ThomasSpeedrunner, Bakayote, Shockwave, Varion Icaria, NeofusionBox, King of HeartsNatsumi: Credits SequenceSpecial Thanks: Shockwave, and Varion Icaria, without them, I might have not been able to fix some of the coding bugs.

Sonic 2: Aluminium Edition is a hack of Sonic the Hedgehog 2 for the Sega Mega Drive/Genesis by Dr. Eggfan. It doesn't feature any ASM content nor new layouts, it's pretty much Sonic 2 with a few new visuals, and for some reason completely different names for the same zones. There's also a partially restored Hidden Palace Zone in there.